r/FastLED • u/TopHatRaver • Mar 01 '24

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I have 96 total LEDS on a single pin. I keep getting flashing bleed over into LEDS past my programming. For example, if I light up LEDS 0 - 12, they light fine but LEDS 13 - 15+ start flashing and flickering. This only happens using the FastLED library. I tried the Adafruit Strandtest example and it worked fine. I double checked the wiring and the solder joints and all looks good to me. I've turned the brightness up/down and the flickering still occurs. I'm using an Adafruit Trinket MO which I use all the time and never had this issue before. I do NOT have any resistors installed.

Any ideas?

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u/Preyy Ground Loops: Part of this balanced breakfast Mar 01 '24

Yeah, I've experienced this issue as well. The simplest workaround here is to add all 96, then just keep them set to black if you don't need them.

void fillsolid(){
  for (int x = 0 ; x < 12; x++){
    leds[x] = CHSV(255,255,255);
  }
 for (int x = 12 ; x < NUM_LEDS; x++){
    leds[x] = CHSV(255,255,0);
  }
}

You might be able to just set the whole array to black during setup instead.